Martin Wheel T658K Lawn & Garden / Industrial Inner Tube, 16X650/750-8 18X650-8 TR13 This quality butyl rubber inner tube fits tire sizes 16/650-8, 16/750-8 and 18/650-8 Use: Lawn and garden, utility, ATV Fits tire size: (16/650-8), (16/750-8), (18/650-8) Valve stem type: Straight (TR-13)